Question: What is the most impressive thing a monkey/ape has ever done under your watch?

Lewis Dean answered on 19 Mar 2014:

There have been some cool puzzles that some of the animals have solved. However, I think that one thing that happened to a friend of mine was pretty cool. She was working with chimps at a sanctuary (I won’t tell you which one!) and one came up and gave her a nut and bolt. As hard as they looked, they couldn’t find out where the chimp had got undone it from and the keepers spent the next few weeks checking everything just in case the chimp was slowly taking everything apart!